某物体受同一平面内的几个力作用而做匀速直线运动，从某时刻起撤去其中一个力，而其它力没变，则该物体

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A：一定做匀加速直线运动

B：一定做匀减速直线运动

C：其轨迹可能是曲线

D：其轨迹不可能是直线

上一题下一题 0.0难度选择题更新时间:2018-09-07 09:38:13

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C

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根据对话选词填空。

had better not , needn't, had better, would rather, mustn't

JENNY: Nick, we____go to bed. It's very late.
NICK: I know, but I ____ help Trig than go to bed. He's tearing up his English exercise book and he's throwing his grammar book round the room. I don't think he's very happy.
JENNY: Well, you ____stay up too long.
NICK: Trig, stop it. You ____ throw your books at the wall. It won't help and you might break something. You ____work at your English now. What are you learning?
TRIG: Abbreviation n 1 U abbreviating, being abbreviated 2 C shortened form of a word, phrase, etc. "Sept" an abbreviation for "September"…
NICK: But Trig, that’s from the dictionary. You ____ learn the whole dictionary by heart!

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